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6,75*2+13,5*2=13,5+27=40,5dm
O=13,5*2+6 3/4=27+ 13,5= 40,5
(6 3/4dm x 2) + (13 1/2dm x 2 ) =13 1/2dm + 27dm = 40 1/2dm
Odp.Obwód to 40 1/2dm.